Randomly getting kicked back to login screen

Just reporting an issue. As I am gaming, regardless of game, I suddenly get kicked back to login screen, and it takes me 2-3 tries to log in (Entering correct password). I am closely monitoring the performance of my PC, in case it's overheating, but it doesn't seem to be the culprit, otherwise my PC would just shutdown or restart. It happened 3 times in the last two hours.